code: def decode_pos(pos):
      """Decoes a scalar position on the board as a pair (i, j)."""
      return pos // 3, pos % 3
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import gym
  from gym import spaces
  from gym.utils import seeding
  import numpy
  from tensor2tensor.data_generators import problem
  from tensor2tensor.layers import modalities
  from tensor2tensor.rl import gym_utils
label_desc: Use image node_id 2 for calling a global function with example usage: decode_pos(pos) and returns: unknown,  unknown